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Information on Business Segments (Property, Plant and Equipment by Geographic Region) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net | [1] | $ 241.4 | $ 267.1
ACCO Brands North America |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net |  | 108.3 | 118.3
ACCO Brands North America | U.S. |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net |  | 107.1 | 116.6
ACCO Brands North America | Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net |  | 1.2 | 1.7
ACCO Brands EMEA | EMEA |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net |  | 88.8 | 92.8
ACCO Brands International |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net |  | 44.3 | 56.0
ACCO Brands International | Australia/N.Z. |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net |  | 12.3 | 12.1
ACCO Brands International | Latin America |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net |  | 30.4 | 42.2
ACCO Brands International | Asia-Pacific |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment, net |  | $ 1.6 | $ 1.7
[1] | Net property, plant and equipment as of December 31, 2020 and 2019 contained $65.8 million and $68.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $11.4 million, $8.9 million and $8.2 million for the years ended December 31, 2020, 2019 and 2018, respectively.

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